A Staten Island ex-con enraged over paying child support hunted down and shot two of his ex-girlfriends in front of their kids before killing himself. Rashawn Mack, 25, fired a single bullet into the heads of both women Thursday - killing one and leaving the other clinging to life. Only a day earlier, he had threatened to kill one of the women over the court-ordered child support. "If you expect me to pay that, get yourself measured for a body bag," Mack warned Rachel Rivas, 24, on Wednesday after she was awarded custody of their 2-year-old son, a law enforcement source said. Mack had been ordered to pay Rivas $25 a week on top of the $50 a month he already was paying Chantel Curtis, the 24-year-old mother of his other young child, sources said. Source. New York Daily News, nydailynews.com. For additional information, please click here (last visited October 30, 2005, reo).